Features: Safety: Our mosquitoes repellent bracelet uses ultrasonic technology, which will not produce harmful chemicals, odors, and is safe for pregnant women and babies. USB charging: Our ultrasonic mosquitoes repellent has a built-in battery, which can be charged and can work for a long time after being fully charged. Our anti-mosquito wristbands is adjustables, suitable for adults and children. Effective mosquitoes repellent: can be used by the whole family-effective mosquitoes repellent, both children and adults can use it, whether you are indoors, camping, fishing, hiking, sports, barbecue are very suitable, giving you a comfortable summer. Our mosquitoes repellent bracelets are your best anti-mosquito products. Principle: the bracelet by imitating the female mosquitoes hate the sound, such as male mosquitoes, dragonflies sound, to achieve the effect of mosquitoes repellent. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Battery capacity: 80mAh Charging time: about 30 minutes Endurances working time: 150 hours Package List: 1x Ultrasonic Mosquitoes Repellent Bracelets